If you are getting notification on your Mac from all other sources, except Whatsapp, it's not an Apple issue. It is a Whatsapp issue. Apple doesn't own Whatsapp. Meta (Facebook) owns Whatsapp and they need to fix whatever their issue is.
If you are getting notification on your Mac from all other sources, except Whatsapp, it's not an Apple issue. It is a Whatsapp issue. Apple doesn't own Whatsapp. Meta (Facebook) owns Whatsapp and they need to fix whatever their issue is.